Name an everyday object that has the same diameter-to-thickness ratio as the Milky Way, and demonstrate that it does using estimates of the size/thickness; this should be an object with a generally similar shape to the Milky Way. Draw both (a) this object, and (b) the Milky Way, both edge-on and face-on.

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?

3. which is not a primary color of light? blue red green yellow

Given the data calculated in parts a, b, c, and d, determine the initial rate for a reaction that starts with 0.85 m of reagent a and 0.70 m of reagents b and c?